6-1-74 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE)
DTC P0133 HO2S (Bank-1 Sensor-1) Circuit Slow Response
WIRING DIAGRAM
Refer to DTC P0130.
DTC DETECTING CONDITION AND TROUBLE AREA
DTC CONFIRMATION PROCEDURE
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Start engine and warm up to normal operating temperature.
4) Increase vehicle speed to 80 – 100 km/h (50 – 60 mph). (engine speed; 2500 – 3000 r/min.)
5) Keep above vehicle speed for 1 min. (Throttle valve operating is kept constant in this step.)
6) Stop vehicle and check DTC and pending DTC by using scan tool.
DTC TROUBLESHOOTING
DTC DETECTING CONDITION TROUBLE AREA
Hi/Low switch cycle average of HO2S voltage is longer than 5
sec.
HO2S
HO2S circuit
ECM (PCM)
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and very careful during to avoid occurrence of an accident.
• Road test, should be carried out with 2 person, a driver and tester, on a level road.
NOTE:
Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PRO-
CEDURE.
• Intake air temperature : between –14°C and 70°C (6.8°F and 158°F)
• Atmospheric pressure : higher than 560 mmHg (Altitude : lower than 2790 m (9150 ft))
• Following DTC is not detected : P0135
Step Action Yes No
1Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag. Flow
Tabl e”.
2 Wire Harness check :
1) Check “RED” and “GRY/YEL” wire.
Are they in good condition?
Go to Step 3. Repair or replace.
3 1) Replace HO2S (B-1 S-1) and recheck.
Is DTC P0133 detected?
Substitute a known-good
ECM (PCM) and recheck.
Faulty HO2S (B-1 S-1).
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